导航星座星间链路仿真分析

针对星间链路系统研制难度大、周期长、代价高的情况,设计并实现了一种星间链路全系统仿真架构。采用了“系统”+“信号”分步仿真架构,分析星间链路系统的星座构型、拓扑选择,重点研究可见性分析和链路优化问题,对星间链路信号的测量误差进行了详细分析,其仿真分析难度适中,易于实现,同时能够为工程研制人员提供完善的仿真分析,有助于提高研制效率。     

基于DSP的H.264视频编解码器的研究及实现

在深入研究H.264标准的编解码原理和参考目前主流算法的基础上,基于德州仪器(TI)的达芬奇(DaVin-ci)TMS320DM6446平台实现了H.264视频编解码器。详细地叙述了主流的X264编解码算法在DM6446平台上移植和优化的每一步工作。注重于具体工程实现技术的讨论,可为相关领域实际工作提供参考。     

深空大规模天线阵布局优化方法研究

由大量廉价的小型反射面天线组成阵列对航天器进行跟踪通信是未来深空测控网发展 的一条新思路。提出一种改进的遗传算法对大规模小天线阵列地理布局进行优化,提高天线 阵列的测控性能。首先分析了布局优化的约束条件,然后以最小化旁瓣电平为目标,建立了 优化模型。分析了Kogan梯度算法和常规遗传算法的局限性,最后给出了改进遗传算法的优 化流程。仿真结果表明,改进的遗传算法不但具有高的优化效率,还可应用于阵列布局的多 目标优化。
     

膜盒气压高度表系统分析与优化方法

建立膜盒气压高度表系统数学模型和几种多变量寻优直接搜索算法,对高度表系统结构与指示误差特性进行分析研究,形成高度表系统分析、模拟调试与优化方法。     

Control and utilization of range-dependent beampattern with waveform diverse array radars

The transmit antenna beampattern of the phased array radar is only a function of angle, limiting its ability to discriminate the targets from the same direction. Recently, the waveform diverse array radars expand the angle-dependent beampattern to an angle-time-range-dependent three-dimensional function by modulating the frequencies/time delays/phases across different transmit antenna elements. In this respect, extra Degrees-of-Freedom (DOFs) in the range domain are achieved, which opens up an innovative way to fulfil the tasks with enhanced system performance by jointly using the angle and range information. This paper summaries the developments of waveform diverse radars, including the Frequency Diverse Array (FDA), the Space-Time-Circulating-Array (STCA), and the Element-Pulse-Coding (EPC) frameworks, with emphasis on the analysis of the range-dependent beampattern from the basic properties upon how it is controlled. Moreover, the most recent advances of utilizing such a range-dependent beampattern in target detection, parameter estimation and identifiability, clutter suppression, jammer suppression and Synthetic Aperture Radar (SAR) imaging are discussed.